Apparatus for spraying mortar, cementitious material and the like



Jan. 29, 1957 P. DASSETTO 2,779,526

APPARATUS FOR SPRAYING MORTAR, CEMENTITIOUS MATERIAL AND THE LIKE FiledSept. 25, 1952 s Sheets-Sheet 1 f I I l- 15 I 2 Fig. 2

, In van/0r /%o/ 5a 5)? Jan. 29, 1957 P. DASSETTO 2,779,626

APPARATUS FOR SPRAYING MORTAR, CEMENTITIOUS MATERIAL AND THE LIKE FiledSept. 25, 1952 s Sheets-Sheet 2 Fig- 3 In ver; 7'01" Pao/ ajs P.DASSETTO 2,779,626 APPARATUSFOR SPRAYING MORTAR, CEMENTITIOUS Jan. 29,1957 MATERIAL AND THE. LIKE 5 Sheets-Sheet 3 Filed Sept. 23, 1952 Fig- 9fII/IIIIIIIII" I I I I I I I I n I [/7 V6 )7 70 r 0 0/0 D4 3:6 #0 6%United States Patent i APPARATUS FER SPRAYlNG MDRTAR, CEMEN- TITIQUSMATERlAL- AND THE LIKE Paolo lJ assetto, Brandizzo, Italy ApplicationSeptember 23, 1952, Serial No. 131L906 Claimspriority, application-ItalyOctober 2, 1951- Tflaims; at: 299-46 This invention relates to an.apparatus for spraying mortar, cementitious mat'erialand-the like.

Itfis an object of this invention to provide an-apparatus easy andinexpensive in construction, which. can be easily handled by evenunskilledworkers and at-the same time affords a uniform distribution anda satisfactory adherence Further features of the invention shallbeunderstood from: the following specification in.which reference is madeto the accompanyingdrawing, wherein:

Figurel is an axial section of the apparatus,

Figure 2 is an elevation from the left of- Fig. 1;

Figure 3 is an elevation of amodification; it

Figure 4 is a plan'view. ofFigure 3;

Figure 5 is a part sectional elevation of a further modifiedconstruction;

Figure 6 is a front view of Figure 5;

Figure 7 shows a modification of Figure 5. embodying three pairs ofnozzles;

Figure 8 is a front view of Figure 7;

Figure9 is a section on line lX-IX of Figure 7, and

Figure 10 is a detail viewof a modified construction.

Referring to Figures 1 and2, 1 denotes a cylindrical receptacle having atapered bottom 1a and provided with a supporting handle 2; The bottom laof the receptacle carries a tappedfitting 3, havingscrewed therein atube 4 which is secured by means of a tapped collar 4a and ends by anozzle 5.

The tube 4 is fed with compressed air through a conduit 6.. Thecompressed air How is governed by. a valve 7 controlled by a lever 8.

An outlet nozzle 9 for the lime, cement or similar slurry contained inthe receptacle 1 is arranged on the axis of the compressed air nozzle 5.

The nozzle 9 is screwed into the receptacle 1 and may be replaced bynozzles differing in diameter according to the purpose for which theapparatus is used.

The apparatus operates in the following manner.

The receptacle 1 is filled with the mortar M to be sprayed, which may bea lime, cement or other slurry. The lever 8 is depressed in order toadmit compressed air into the receptacle It. The compressed air issuesfrom the receptacle through the nozzle 9 carrying along the mixturewhich is sprayed on to the wall or other surface to be coated.

The apparatus is further provided with means for continuously supplyingmortar to the receptacle. For this purpose the receptacle carries at itstop a tapped fitting 10 having screwed therein a tube 11 connectedthrough a hose 12 with a larger reservoir in which the mortar isprepared. A pump (not shown) supplies mortar from the main reservoir tothe receptacle 1 and a cock 13 intercepts at will the mortar supply.

o jet.

ice

The receptacle 1 is closed a top cover 14, which may be fastened bymeans of a bayonetjoint 15 and is formed witha semi-cylindricalextension 16 extending within the reservoir and forming a baflle for theoncoming mortar On the remote side of the baflle 16, a vent 17 is boredin the receptacle 1.

In the construction shown in Figures 3 and 4, the receptacle l is openat the top and mortar is filled in directly by the worker who holds theapparatus by his-left hand gripping the handle 2, his right handcontrolling the valve 7, the receptacle 1 being lowered like a. spooninto the mortar reservoir. 7

In the modified construction shown in Figures 5 and 6,

the handle 2 is dispensed with and a handle 18 is provided.

adjacent the valve 7. in this case the receptacle is smaller than in thepreviously described constructions and-can be held by one hand only. p

The edge 1b of the top openingof the receptacle is situated in a planewhich is inclined to the axis of the spray nozzle, instead of beingparallel thereto and forms to 'said axis a sharp angle a on the jetissue side. The

jet can thus be directed obliquely upwards for covering ceilings withoutthe mortar overpouring from the top opening of the receptacle.

An opening is bored in the casing in front of the nozzle 5 and hasfitted to its outer edge a thin annular-reinforcig disc 9a, forming athin-walled, for instance 1-l.5 millithe lower portion of thereceptacleis tapered only on itsfront andrear walls, while the sidewalls are not tapered, so that a plurality of spray nozzles can beprovided;

In the example shown, the casing .l is provided with.

three air nozzles provided within tapped connections 19,transverselyconnected together by means of conduit-s 29. The structurecomprising the connections 19 and conduits 20 islaterally welded to thecasing 1. The casing 1 is provided at each connection with a nozzle 9for spraying the slurry.

Each of the air nozzles comprises a member 21 that may be screwed intothe connection 19 and secured therein through the interposition of apacking 22 against an annular abutment on the connection 19. An axialhole 21a is bored in the member 21 and forms the nozzle proper. The rearend of the lateral connections is closed by a screw-threaded plug 23through the-interposition of an annular packing 24.

The central connection 19 is fitted with an axially bored fitting 25, inlieu of the plug 23, to which the valve 7, handle 18 and air supply pipe6 are fitted.

The compressed air is fed to the nozzles 21, whereby the slurry issprayed simultaneously through all the nozzles 9.

According to the embodiment shown in Figure 10, the air nozzle for thelateral connection and the plug for closing the connection are in theform of a single member 26 that can be screwed into the connection 19and in which cross holes 27 are centrally bored and cornmunicate withthe transverse conduits iii, an axial hole 28 being bored in the member26 for the discharge of compressed air. The member 26 is provided with arear hexagonal head 29 serving as a plug for closing the connection 1h.

What I claim is:

1. An apparatus for spraying mortar, cementitious material and the likecomprising, in combination, a container in the form of a portablereceptacle open at the top, at least one compressed air delivery nozzlelocated in said container near its bottom and fitted in an opening provided in the side wall of the container, said nozzle being spaced fromsaid bottom and facing a circular discharge Fatented Jam 29, 1957.

opening coaxial with the nozzle and provided in a zone in the side wallof the container substantially at right angles to the nozzle axis, atleast the part of the container in which the nozzle is located beingbuilt up in the form of a hopper, whereby the material to be sprayed isdirected to the zone at which the air jet leaves the nozzle outlet, athin annular metallic reinforcing disc being provided on the outersurface of the portion of the side wall in which the discharge openingis formed, said disc being coaxial with said discharge opening andhaving its inner diameter equal to the diameter of said dischargeopening.

2. An apparatus for spraying mortar, cementitious material and the likecomprising, in combination, a container in the form of a portablereceptacle open at the top, at least one compressed air delivery nozzlelocated in said container near its bottom and fitted in an openingprovided in the side wall of the container, said nozzle being spacedfrom said bottom and facing a circular discharge opening coaxial withthe nozzle and provided in a zone in the side Wall of the containersubstantially at right angles to the nozzle axis, at least the part ofthe container in which the nozzle is located being built up in the formof a hopper, whereby the material to be sprayed is directed to the zoneat which the air jet leaves the nozzle outlet, the common axis of thecompressed air delivery nozzle and of the discharge opening forming withthe plane in which the top edge of the container is located a sharpangle on the jet side whereby the latter can be directed obliquelyupwardly for covering ceilings Without the material being sprayedoverflowing from the top opening of the container.

3. An apparatus for spraying mortar, cementitious material and the likecomprising, in combination, a container in the form of a portablereceptacle open at the top, at least one compressed air delivery nozzlelocated in said container near its bottom and fitted in an openingprovided in the side wall of the container, said nozzle being spacedfrom said bottom and facing a circular discharge opening coaxial withthe nozzle and provided in a zone in the side wall of the containersubstantially at right angles to the nozzle axis, at least the part ofthe container in which the nozzle is located being built up in the formof a hopper, whereby the material to be sprayed is directed to he zoneat which the air jet leaves the nozzle outlet, means provided on theouter surface of the part of the side wall in which the dischargeopening is formed to reinforce said discharge opening, said means beingcoaxial with said discharge opening and having its inner diameter equalto the diameter of the discharge opening.

4. An apparatus for spraying mortar, cementitious material and the likecomprising, in combination, a container in the form of a portablereceptacle having side walls and being open at its top and adapted tocontain a substantial quantity of the material to be sprayed, at leastone compressed air delivery nozzle disposed in said container near itsbottom but spaced therefrom and communicating with the exterior of saidcontainer through an opening provided in one side wall of saidcontainer, the side wall of the container opposite the discharge end ofsaid nozzle being provided with a circular discharge opening alignedwith said nozzle, said discharge opening having an axial length which isless than the diameter of said opening, the discharge end of said nozzlebeing spaced from said outlet opening so that said opening is at alltimes free from contact with said nozzle.

5. An apparatus for spraying mortar, cementitiou s ma terial and thelike, as defined in claim 4, wherein the opening in said side wall ofthe container is threaded and wherein said nozzle has a threaded portionreceived in said opening.

6. An apparatus for spraying mortar, cementitious material and the likecomprising, in combination, a container in the form of a portablereceptacle having side walls and a bottom and being opened at its topand adapted to contain a substantial quantity of the material to besprayed, a plurality of compressed air delivery nozzles disposed in saidcontainer in laterally adjacent parallel relationship adjacent saidbottom, said nozzles having discharge ends facing one of said sidewalls, said side wall opposite said discharge ends being provided with acircular discharge opening aligned with each of said nozzles, eachdischarge opening having an axial length which is less than the diameterof said opening, the discharge end of each nozzle being spaced from itsrespective outlet opening so that said opening is at all times free fromcontact with said nozzle.

7. An apparatus for spraying mortar, cementitious material and the like,as defined in claim 6, wherein said compressed air delivery nozzles aresupported by a transverse delivery duct having an inlet opening adaptedto communicate with a compressed air delivery hose, said duct beingsecured to the side of the container opposite said side having thedischarge openings adjacent said bottom, each of the nozzles projectinginto the container from said transverse delivery duct.

References Cited in the file of this patent UNITED STATES PATENTS1,239,075 Bagnall et a1. Sept. 4, 1917 1,566,325 Hansen Dec. 22, 19251,755,329 McCormack Apr. 22, 1930 2,305,269 Moreland Dec. 15, 1942FOREIGN PATENTS 441,436 Great Britain Ian. 20, 1936

